Brockhaus and Efron Encyclopedic Dictionary (35 volumes, small; 86 (?) volumes, large) was published in Imperial Russia in 1890-1906. Its reprints appeared collapse of the Soviet Union. It is also available online from several Russian_language sites.
Brockhaus himself edited the 2nd edition (1812-1819, 10 vols.), and, when vol.
Brockhaus died in 1823, and his two eldest sons, Friedrich and Heinrich, edited the 6th edition with Hasse's assistance in September 1823.
August Kurtzel, aided by Oskar Pilz, edited the 10th edition, assisted by Heinrich Edward Brockhaus, and Heinrich Rudolf Brockhaus, the younger son, assisted in the 11th edition.
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